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Mass Transfer

Mass Transfer
When the temperature and humidity of air is low, we usually use __________ draft cooling tower.

Forced
Induced
Natural
None of these

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Mass Transfer
Reboiler is considered as one theoretical plate, because

Vapour is recycled to the column
None of these
Reboiler itself contains one plate
Of the assumption that vapour and liquid leaving the reboiler are in equilibrium

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Mass Transfer
Schmidt number is given by

Re/Pe
Re.Pe
Sh x Pe
Μ/ρDAB

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Mass Transfer
In extractive distillation, solvent is

Of high volatility
Of high viscosity to give high tray efficiency
Present in overhead stream
Added to alter the relative volatility of the mixture

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Mass Transfer
Back-trapping in a distillation column

Increases tray efficiency
Decreases tray efficiency
Is desirable, as it provides improved vapour-liquid contact
Reduces pressure drop

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Mass Transfer
Antibiotics are best handled in a

Podbielniak extractor
Pulsed column extractor
Rotating disc contactor
Sieve tray contractor

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